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LCL APF based on fractional-order fast repetitive control strategy

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Abstract

The LCL type active power filter (APF) with a traditional repetitive controller has drawbacks in terms of poor dynamic performance, large steady-state error, and difficult digital implementation. A fast repetitive control (RC) algorithm was proposed in this paper in an effort to improve the APF dynamic performance without worsening its stability. To eliminate the non-integer delay of the traditional RC, a fractional-order RC algorithm based on the Lagrangian Interpolation was developed. The proposed fast fractional-order RC (FFORC) strategy only needs 1/6 delay time when compared to the traditional RC. In addition, it can track the error signal quickly and obtain a higher steady-state accuracy. Furthermore, the double current loops control method with grid side current and inverter side current feedback is proposed to achieve active damping of the resonance peak of the LCL filter, which ensures that the APF system is stable. Simulation and experimental results are presented to verify the performance of the dynamic response and steady-state accuracy of the proposed FFORC strategy.

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Acknowledgements

This research is financially supported by Key R&D Program of Zhejiang Province, China (2021C01112) and The National Key Research and Development Program of China (2017YFA0700301).

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Authors and Affiliations

  1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, China

    Guobing Pan, Fei Gong, Libing Jin, Hao Wu & Sihan Chen

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  1. Guobing Pan
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  2. Fei Gong
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  3. Libing Jin
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  4. Hao Wu
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  5. Sihan Chen
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Correspondence to Guobing Pan.

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Pan, G., Gong, F., Jin, L. et al. LCL APF based on fractional-order fast repetitive control strategy. J. Power Electron. 21, 1508–1519 (2021). https://doi.org/10.1007/s43236-021-00301-0

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  • DOI: https://doi.org/10.1007/s43236-021-00301-0

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